Choice Card

Belongs to subject Atomic Nucleus

A nucleus of **hydrogen** always has one proton (Z = 1), and in nature, 99.98% of all hydrogen nuclei have 0 neutrons (N = 0). What is the mass number A?

- 2

A = N+Z = 0+1 = 1 - 0

A = N+Z = 0+1 = 1 - 1

Correct! - -1

A = N+Z = 0+1 = 1